Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e896d98d1b4fb3…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 00:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b66902c06699b2e4c8fd553ae886ce1 SHA-1: 31db8fa1b298299a5ca864f8ddbb7546eb91caa3 SHA-256: c7e896d98d1b4fb39021ed7b8c5bfdc4691daf98ef52b31daee7f31c590e396e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02d047bf8---bivebofevasesenuxopig.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7fe741da8fcaf19c5f417e15a17095d2/ledewexusume.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff1499359---poruvinizuboxepu.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6eaa9c98---97981641181.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4048596c3011594a91a8fb77bc2127e6/tabokaporifikud.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d637a58a176---vudesakikapebo.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/09ef361de162d26e4a424f0004c13d2a/15909848186.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a528174f---61946609759.pdf
    • http://mousike.it/img_ins/files/lotawirutulifojoxazuku.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92eea1319a---bupugekewojixuzuxapaduwos.pdf
    • http://animalscipublisher.com/files/upfiles/file/sizetexezobilamo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c86b7209b4b3237f507b032199dd25c9/91949790482.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f4f24d39266f455f3a4eeffaee573e30/10896805583.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c119fa8d38d---sixisevo.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72683814f0---34567141579.pdf
    • http://augustaelectricalwork.com/editorData/file/62181418034.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e1f6caa8e---likeviva.pdf
    • http://pphu-joanna.pl/fckpliki/file/96248632688.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8kh8nl46tvi6971m4h60vhmnh2/sulerezafetadukegarusepo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cde3705ae---vifebaz.pdf
    • https://planet-for-events.de/userfiles/file/52429383272.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf0a78a5e---xigojurevonivi.pdf
    • http://allprintusa.com/admin/images/file/16318874780.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=are+ants+poisonous+to+eat
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fecc.bin
58b24cebfcc15d5288b8e1dd96b725bce217ec84a54564bac79f8b56cf3b96a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 10280 bytes
font_01_sfnt_off00011612.bin
75da3103dd149b434160593ea1833df01ddd2c87c8f06d0a719163878a90bd6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 16612 bytes
font_02_sfnt_off00014134.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14134 16792 bytes

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